"Every child deserves to be excited they are a part of life," Michelle tells PEOPLE after just revealing that she is pregnant with her 20th child. "Even when we were having our 5th and 6th [kid] ... we would celebrate each pregnancy."

"If we felt that way, we would have stopped back with our second birth," insists Michelle, 45, who experienced preeclampsia during her second pregnancy with twins John David and Jana, now 21. "There are many women who have experienced preeclampsia and have gone on to have more children."

"That whole mind set that you stop after a problem pregnancy isn't realistic," she continues. "You may encounter struggles along the way. You may not have a perfect pregnancy, but each child is a precious gift."

The Duggars, who star on TLC's 19 Kids and Counting, live debt free in a house they built themselves in Tontitown, Ark. They have also come under fire from those suggesting that their older kids have too much responsibility caring for the younger ones and that they don't pay enough individual attention to their kids.

"We homeschool, so we are around our children day in and day out," says Jim Bob, 46. "Because I am in real estate, I am home and can be with the children a lot. When we go to the store or run errands, we take the kids one on one and we get to spend more time individually than a lot of parents do."

Michelle, who is under the care of a high-risk pregnancy doctor, agrees: "The beauty of being in a large family," she says, "is that everyone works together as a team and it is about teaching our children responsibility."

And, she says, the family doesn't take their critics to heart.

"There are a lot of good things we can learn from our critics," she says. "We really believe we are following our faith and there are sometimes going to be people who don't agree and we aren't going to worry about the negative things stated."